Tropical Storm Cristobal, the third named storm of what is expected to be an active hurricane season has officially made landfall in the United States on Sunday in Louisiana between the mouth of the Mississippi River and Grand Isle.

With maximum sustained winds near 50 mph, Cristobal is expected to move north at about 7 mph, the National Hurricane Center said. It should become a tropical depression within 24 hours and will continue to dump heavy rain that could lead to flash flooding, mainly across the Mississippi River Valley in Louisiana, Mississippi, and Arkansas.

Life-threatening storm surges could occur in parts of Mississippi and Louisiana. Storm surges occur when rising water moves inland from the coast, potentially causing injury and damage to property.

In view of the storm, US President Donald Trump recently promised aid for the state from the federal funds. He intends to sign an emergency declaration soon.

New Orleans issued a voluntary evacuation order Sunday afternoon as well for areas outside the levee system.

According to meteorologists and experts, this season is heavier than usual in terms of storms.